1 class AModuleApi:
 2     def testA(self):
 3         pass
 4 class AModuleImpl(AModuleApi):
 5     def testA(self):
 6         print "Now Call testA in AModule!"
 7 class BModuleApi:
 8     def testB(self):
 9         pass
10 class BModuleImpl(BModuleApi):
11     def testB(self):
12         print "Now Call testB in BModule!"
13 class CModuleApi:
14     def testC(self):
15         pass
16 class CModuleImpl(CModuleApi):
17     def testC(self):
18         print "Now Call testC in CModule!"
19 class Facade:
20     def test(self):
21         a=AModuleImpl()
22         a.testA()
23         b=BModuleImpl()
24         b.testB()
25         c=CModuleImpl()
26         c.testC()
27 Facade().test()